Spider and Chainrings combination of a 46 teeth outer Chainring and a inner 30 teeth chainring, merged together to a spiderring with direct mount. It eliminates frame interferences that can cause problems on 30 teeth inner chainring.
Oval Rotor QX1-Rings increase the power stroke by minimizing the intensity of the "dead spot" zones. For REX 1.1 and REX 2.1 cranks with 76mm BCD. Special single speed teeth design prevents chain suck.